Rotor



H. G. REIST Oct. 16, 1923.

ROTOR Filed Jan. 13, 1928 R, s e

fla w n WW A. kn s e i H H Patented Oct. -16, 1 928.

UNITED STATES PATENT OFFICE.

HENRY G. REIS'1, SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRTC COMPANY, A CORPORATION OF NEW YORK.

' ROTOR.

App1ication filedJanuary 13, 1928. Serial No. 246,630.

My invention relates to rotorsfor dynamoelectric machines and has for its object the provision of an improved construction in which the magnetic structure is mounted on a central supporting structure in such manner that centrifugal stresses in the magnetic structure are not transmit-ted to the central supporting structure, and in which the lat ter can be readily constructed at a plurality of flat plates secured together.

My present invention will be more fully set forth in the following description referring to the accompanying drawing and the features of novelty which characterize my invention will be pointed out with particularity in the claims'annexed to and forming a part of this. specification.

In the drawing, Fig. 1 is a fragmentary end view of my improved rot-or partly broken away; Fig. 2 is a transverse section on the line 2-2 of Fig. 1; Fig.3 is a perspective view partly broken away of a portion of the rotor with the pole pieces removed and Fig.

4 is a section on the line 44c of Fig. 1.

Referring to the drawing, the embodiment of my improved rotor shown therein includes a magnetic structure comprising pole pieces 10 and an annular body 11 which is mounted on a central supporting structure keyed to the rotor shaft in the usual manner. In building the magnetic structure, a plurality of fiat arcuate plates 12 are punched or out out of metal plates with dovetail slots 12 and holes formed therein in such relation that when the arcuate plates are assembled in staggered relation with their edges presented outwardly, that thedovetail slots and holes are aligned so as to form slots and holes extending axially through the rotor. These arcuate plates are secured together by bolts 12* extending through the holes therein so as to constitute a rigid continuous annular body 11 and the pole pieces 10 are secured to this annular body by dovetail projections 1O which closely fit the dovetail slots 12 formed therein and are retained in the slots by end plates 13 bolted to each end of the annular body. Although I prefer to secure the pole pieces 10 to the annular body 11 by the use of dovetail slots, they maybe secured thereto inany other convenient manner. The pole ieces 10 are provided with exciting windings 10 which are retained in place by coil retaining clamps 10.

central supporting structure which in "accordance with my present invention comprlses annular plates 14 spaced apart axially of the rotor and welded to hub members 15.

The annular plates, which may have holes 1 1 formed therein to lighten the structure, and the hub members are rigidly connected together by radially arranged webs 16 extending between them and welded thereto. Openings 1 F are formed in the annular plates 14: to lighten the structure and to facilitate the circulation of air. through the rotor.

In order to prevent centrifugal stresses being transmitted from the magnetic structureto the central supporting structures, I form keyways 1'? in the former and keyways 18 inthe latter, having their sides in alignment, and place keys 19 therein between plates 20 bolted to one or the plates 14 and an annular braking plate 21 bolted to the other of the plates 14: to which a brake may be applied to stop the rotor. These keys form a driving connection for transmitting torque between the magnetic structure to the central supporting structure Without restricting radial movement of the former relative to the latter whether the rotor is used in a motor or a generator. are formed in each of the plates 12, when it is cut or punched out, in such manner that when the plates are assembled, the keyways 17 extend entirely across the inner periphery The keyways 17 of the annular body. The keyways 18 are formed in blocks 19 which extend between the plates 14 and are Welded thereto and to the ends of the Webs so that the blocks reinforce the central supporting structure in addition to carrying the keys 19 which form the driving connection between the magnetic and central supporting structures. The keys 19 are each made in two tapering parts which It will be seen that in the foregoing de- The magnetic structure is mounted on a scribed construction, the centrifugal stresses lo in the magnetic structure, which comprises most of the weight of the rotor, are-resisted substantially altogether by circumferential tension in the annular body 11 for the reason that the latter is freely supported on the central supporting structure by the keys 19 and cannot transmit radially acting forces thereto. Moreover, the arrangement of the plates which constitute the central support ing structure, is such that it can readily be constructed of parts out or punched out of metal plates. 7

Modifications of my improved rotor construction will occur to those skilled in the art, so that I do not desire to be limited tothe particular construction set forth except as defined in the appended claims.

What I claim as new and desire to secure I by Letters Patent of the United States, is

1. A rotor for dynamo-electric machines having a central supporting structure comprising a plurality of axially spacedannular plates and radially extending webs arranged etween said plates, said webs being connected to said plates to form a rigid supporting structure, an annular body surrounding said central supporting structure, and means including keys carried by said webs for forming a driving connection between said central supportin structure and said annular body, said keys CERTIFICATE 0F Patent No. 1,687,5i3.

HENRY G.

eing arranged to provide for out:

ward movement of said annular body relative to said central supporting structure independently thereof when they are subjected to centrifugal stresses, so that centrifugal forces acting on said annular body will be re sisted substantially altogether by tension stresses therein. 1

2. A rotor for dynamo-electric machines having a central supporting structure comprising a plurality of axially spaced hub members each having an annular plate secured thereto, radially extending webs connecting said plates and said members to form a rigid supporting structure, an annular body surrounding said central supporting structure having pole pieces secured thereto, and

means including keys carried by said webs HENRY G. REIST.

' CORRECTION.

Granted October 16, 1928,, to

REisT.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Page 1, lint 9, for the word "at" read "of"; and that the said Letters Patent should be read with this correction therein that the same may conform to Patent Office.

the record of the case in the Signedand sealed this 11th day of December, A. D. 1928.

(Seal) M. J. Moore, Acting Commissioner of Patents. 

